Fork of Sized Points on a Map
This example displays a world map with cities exceeding 50,000 in population, using circles sized and colored by population via a square-root scale. The map uses a natural Earth projection with graticules and land boundaries from the World Atlas TopoJSON, styled with CSS. Data is loaded from Simplemaps' World Cities Database using d3.csv. The visualization is built with React, rendering SVG paths for geography and circles for cities, using d3.geoNaturalEarth1, d3.geoPath, and d3.geoGraticule for the map projection and graticule lines.